SAPPHIRE CRYSTALS - Isle of Mull, Scotland
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Nuns’ Pass, Carsaig, Isle of Mull, Scotland
The blue variety of corundum is sapphire, the red variety being ruby. Rare sapphires can be found on the Isle of Mull as blue, tabular crystals within an igneous sill intruded into the surrounding rock when the island was an active volcano.Nuns’ Pass, Carsaig, Isle of Mull, Scotland
The chemistry of the sapphire formation is complex but is a result of high temperature metamorphism of rock fragments (xenoliths) contained within the magma that formed the sill.
The surrounding rock has been removed by acid to reveal the crystals.
Size: 5 x 5 x 4 centimetres
Weight: 130 grams
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